CN217462598U - Through-flow structure of ventilator and backward centrifugal ventilator - Google Patents
Through-flow structure of ventilator and backward centrifugal ventilator Download PDFInfo
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- CN217462598U CN217462598U CN202221555046.6U CN202221555046U CN217462598U CN 217462598 U CN217462598 U CN 217462598U CN 202221555046 U CN202221555046 U CN 202221555046U CN 217462598 U CN217462598 U CN 217462598U
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Abstract
The utility model discloses a through-flow structure of a ventilator and a backward centrifugal ventilator, wherein the through-flow structure of the ventilator comprises an impeller, a casing and an air inlet, and the impeller comprises a plurality of blades, an impeller front disc and an impeller rear disc; the air inlet is arranged on the front side plate of the shell and is connected with the front side plate of the shell; inside the ventilation blower, have rectification portion in the cavity between the preceding curb plate of casing and the impeller head, rectification portion includes the fillet that a plurality of arranged along circumference distributes. The utility model discloses a ventilation blower through the rectification structure to weaken airflow vortex and internal leakage loss wherein, thereby improve ventilation blower aerodynamic performance parameter and efficiency, reduce energy consumption.
Description
Technical Field
The utility model relates to a ventilation blower technical field, in particular to through-flow structure and backward centrifugal fan of ventilation blower.
Background
The through-flow part of the centrifugal ventilator mainly comprises an impeller, a casing and an air inlet, wherein the impeller is a rotating part and applies work to gas, the casing and the air inlet are static parts, the air inlet is used for smoothly guiding axial inlet air into the impeller, and the casing collects and guides gas flowing out of an impeller outlet and discharges the gas out of the ventilator. The axial width of the volute of the low-pressure backward centrifugal fan is larger than that of the impeller, two cavities are respectively formed between the front disk and the rear disk of the impeller and between the front side plate and the rear side plate of the casing, and high-pressure gas flowing out of the outlet of the impeller flows into the cavities under the action of pressure difference.
The air flow flowing into the cavity between the impeller rear disc and the casing rear side plate partially flows out of the casing through the annular gap between the rear side plate inner shaft hole and the ventilator impeller driving shaft to form external leakage. The airflow flowing into the cavity between the front disk of the impeller and the front side plate of the casing has large axial width, so that on one hand, the airflow forms large vortex motion to consume energy, and on the other hand, a small part of the air flows into the impeller through the annular gap between the inner hole of the front disk of the impeller and the air inlet, so that internal leakage is formed, the impeller works repeatedly on the part of the air, the energy is wasted, and the outlet flow of the impeller is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a through-flow structure and back centrifugal fan of ventilation blower aims at solving present back centrifugal fan aerodynamic performance parameter and the technical problem that inefficiency and energy consumption are high.
In order to realize the above purpose, the utility model provides a through-flow structure of ventilation blower includes:
the impeller comprises a plurality of blades, an impeller front disc and an impeller rear disc;
the impeller comprises a casing, wherein a rectification part is arranged in a cavity between a front side plate of the casing and an impeller front disc, and the rectification part comprises a plurality of rectification pieces which are circumferentially distributed along the front side plate of the casing; and the number of the first and second groups,
the air inlet is arranged on the front side plate of the shell and is connected with the front side plate of the shell.
Optionally, each of the fairings is radially and uniformly distributed on the front side plate of the casing.
Optionally, a conical arc-shaped cylinder is arranged on one side, close to the impeller front disc, of the front side plate of the casing, and an air inlet flange for installing the conical arc-shaped cylinder is further arranged on the front side plate of the casing to form the air inlet.
Optionally, the inside edge pitch arc of cowling panel with the awl arc barrel periphery pitch arc laminating of air intake.
Optionally, the thickness of fairing and the thickness of the conical arc barrel of the air inlet are the same.
Optionally, the outer diameter Φ D3 of the flange surface of the air inlet flange is greater than the outer diameter Φ D2 of the flange surface of the impeller rear disk.
Optionally, the number of the fairing pieces is 6-18, and is greater than the number of the blades.
Optionally, the outer diameter Φ Dt = (0.94-1.06) D2 of the rectifying portion.
Optionally, the axial height t of the rectifying portion is less than half of the axial height K of the air inlet, and t = (0.04-0.06) D2.
The utility model also provides a backward centrifugal fan, backward centrifugal fan includes the through-flow structure of foretell ventilation blower.
The technical scheme of the utility model among, through install a set of cowling panel of arranging along the circumferencial direction additional in the air intake inboard, be located the preceding curb plate of casing and the preceding curb plate one side of just being close to the casing in the cavity between the impeller front bezel, formed a rectification structure, and then weaken airflow vortex and internal leakage loss wherein to improve the pneumatic performance parameter of ventilation blower and efficiency, reduce energy consumption.
Drawings
Fig. 1 is a schematic structural view of an embodiment of a through-flow structure of a ventilator according to the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a cross-sectional view of FIG. 2;
figure 4 is a side view of the through-flow structure of an unmodified ventilator.
In the figure: the ventilator comprises a through-flow structure-100, an impeller-1, blades-11, an impeller front disc-12, an impeller rear disc-13, a rectifying part-2, a rectifying sheet-21, an air inlet-3, a conical arc-shaped cylinder-31 and an air inlet flange-32.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
For a better description and illustration of embodiments of the application, reference may be made to one or more of the drawings, but additional details or examples for describing the drawings should not be construed as limiting the scope of any of the inventive concepts of the present application, the presently described embodiments, or the preferred versions.
In the description of the present invention, it should be noted that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate the position or positional relationship based on the positional relationship shown in the drawings, and are only for convenience of describing the present invention, but do not indicate that the device referred to must have a specific position or be operated in a specific orientation, and thus, cannot be construed as limiting the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In the through-flow structure of the existing ventilator, the airflow flowing into the cavity between the front disk of the impeller and the front side plate of the casing has large axial width of the cavity, so that on one hand, the airflow forms large vortex motion in the cavity to consume energy, and on the other hand, a small part of the air flows into the impeller through an annular gap between an inner hole of the front disk of the impeller and an air inlet, so that internal leakage is formed, the impeller repeatedly does work on the part of the air to waste energy, and the outlet flow of the impeller is reduced.
In view of this, the present invention provides a through-flow structure of a ventilator and a backward centrifugal ventilator, fig. 1-4 show an embodiment of the through-flow structure of the ventilator, please refer to fig. 1-4, the through-flow structure 100 of the ventilator includes an impeller 1, a casing (not shown in the figure), and an air inlet 3.
Referring to fig. 1, the impeller 1 includes a plurality of blades 11, an impeller front disk 12 and an impeller rear disk 13, of course, each of the blades 11 is integrated and driven by a motor, and the blade 11 is integrally located between the impeller front disk 12 and the impeller rear disk 13; the casing is a ventilator casing, a rectification part 2 is arranged in a cavity between a front side plate (not shown) of the casing and the impeller front disc 12, the rectification part 2 is a plurality of rectifying pieces 21 which are distributed in an arrangement manner along the circumferential direction of the front side plate of the casing, and the rectifying pieces 21 are distributed in an arrangement manner in the axial direction; the air inlet 3 is arranged on the front side plate of the shell and is connected with the front side plate of the shell. It should be noted that, in this embodiment, the air inlet 3 is formed by extending an air inlet flange 32 disposed on a front side plate of the casing toward the inside of the casing, the air inlet flange 32 is fixed on the casing by a bolt, of course, the front side plate opening of the casing may also extend toward the impeller front disk 12 to form the air inlet 3, and the casing is mostly in a volute shape and is composed of a front side plate of the casing, a rear side plate of the casing, the air inlet, the air outlet, and a volute main plate, which will not be described in detail herein.
The technical scheme of the utility model among, through installing a set of cowling panel 21 of arranging along the circumferencial direction additional in 3 inboards of air intake, and be located the preceding curb plate of casing and the cavity between the impeller front bezel 12, be close to preceding curb plate one side of casing, formed a rectification structure, and then weaken airflow vortex and internal leakage loss wherein to improve ventilation blower aerodynamic performance parameter and efficiency, reduce energy consumption.
In order to optimize the effect of the rectifying part 2 on the airflow vortex and internal leakage restriction in the cavity between the front side plate of the casing and the front disk 12 of the impeller, referring to fig. 1, in the present embodiment, the rectifying pieces 21 are uniformly distributed on the front side plate of the casing in a radial shape. The space limiting and weakening effect of the airflow vortex in the cavity is embodied in two aspects: one is the reduction of the swirl width in the axial direction, and the other is the ability to provide a degree of restriction in the circumferential direction. Further, the weakening of the gas disturbance effect in the cavity can also reduce the leakage loss, thereby improving the flow and pressure of the outlet of the impeller 1 and the outlet of the ventilator, and simultaneously reducing the energy loss. Of course, the embodiments of the present invention are not limited to this, and may be arranged in other manners, which are not described in detail herein.
Specifically, referring to fig. 1, in this embodiment, a conical arc cylinder 31 is disposed on a side of the front side plate of the casing, which is close to the front disk 12 of the impeller, the conical arc cylinder 31 extends inward from an opening of the front side plate of the casing, and an air inlet flange 32 for mounting the conical arc cylinder is further disposed on the front side plate of the casing, so as to form the air inlet 3.
Furthermore, in this embodiment, the inner edge arc of the fillet 21 fits the outer circumference arc of the conical arc cylinder 31 of the air inlet 3, so as to reduce the gas flow between the fillets 21 and better limit the vortex width in the circumferential direction.
Furthermore, in this embodiment, the thickness of the rectifying plate 21 is the same as that of the conical arc-shaped cylinder 31 of the air inlet 3, so that the integral forming is facilitated, and the overall strength of the rectifying part 2 is improved.
In order to facilitate the installation, disassembly and maintenance of the impeller, please refer to fig. 2-4, in this embodiment, the outer diameter Φ D3 of the flange surface of the air inlet 3 is greater than the outer diameter Φ D2 of the rear disk 13 of the impeller. Fig. 4 shows an unmodified through-flow structure 200, in which the outer diameter of the flange surface of the air inlet is smaller than that of the flange surface of the impeller back disk.
In order to make the rectifying portion 2 have better effects on limiting the air flow vortex and the inner leakage in the cavity between the front side plate of the casing and the front impeller disc 12, please refer to fig. 2 and 3, in this embodiment, the number of the rectifying pieces 21 is 6 to 18, and is greater than the number of the vanes 11.
In order to make the rectifying portion 2 have better effects on the airflow vortex and the internal leakage restriction in the cavity between the front side plate of the casing and the impeller front disk 12, referring to fig. 2, in the present embodiment, the outer diameter of the rectifying portion 2, that is, the outer diameter Φ Dt = (0.94-1.06) D2 of the circumference formed by each rectifying plate 21.
In order to make the rectifying portion 2 have better effects on the airflow vortex and the internal leakage restriction in the cavity between the front side plate of the casing and the front disc 12 of the impeller, referring to fig. 2, in this embodiment, the axial height t of the rectifying portion 2 is less than half of the axial height K of the air inlet 3, and t = (0.04-0.06) D2.
Some embodiments of the present invention perform the pneumatic performance comparison respectively, as follows:
it can be seen that adopt the utility model discloses a through-flow structure of ventilation blower, the static pressure and the static pressure efficiency of its ventilation blower have obvious improvement, the ventilation blower maximum flow also increases to some extent, and the improvement of static pressure efficiency means the reduction of energy consumption promptly simultaneously.
The utility model also provides a backward centrifugal fan, backward centrifugal fan includes the through-flow structure 100 of foretell ventilation blower.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A through-flow structure of a ventilator, characterized in that the through-flow structure comprises:
the impeller (1) comprises a plurality of blades (11), an impeller front disc (12) and an impeller rear disc (13);
the impeller comprises a casing, wherein a rectifying part (2) is arranged in a cavity between a front side plate of the casing and an impeller front disc (12), and the rectifying part (2) comprises a plurality of rectifying pieces (21) which are distributed along the circumferential direction of the front side plate of the casing; and the number of the first and second groups,
and the air inlet (3) is arranged on the front side plate of the shell and is connected with the front side plate of the shell.
2. A ventilating structure of a ventilator according to claim 1, wherein the respective rectifying blades (21) are uniformly distributed in a radial shape on a front side plate of the casing.
3. The through-flow structure of a ventilator according to claim 1, wherein a conical arc-shaped cylinder (31) is provided on a side of the front side plate of the casing close to the impeller front disk (12), and an air inlet flange (32) for mounting the conical arc-shaped cylinder (31) is further provided on the front side plate of the casing to form the air inlet (3).
4. A fan throughflow structure according to claim 3, wherein the inner peripheral arc of the rectifying plate (21) conforms to the outer peripheral arc of the tapered arc cylinder (31).
5. The through-flow structure of a ventilator according to claim 3, wherein the thickness of the rectifying plate (21) is the same as the thickness of the conical arc-shaped cylinder (31).
6. Flow structure for a ventilator according to claim 3, characterized in that the flange surface outer diameter Φ D of the air inlet flange (32) 3 Is larger than the outer diameter phi D of the flange surface of the impeller rear disc (13) 2 。
7. A through-flow structure of a ventilator according to claim 1, wherein the number of the rectifying pieces (21) is 6 to 18 pieces and is larger than the number of the blades (11).
8. Flow-through structure of a ventilator according to claim 1, characterized in that the outer diameter Φ D of the fairing part (2) t =(0.94-1.06)D 2 。
9. The through-flow structure of a ventilator according to claim 1, characterized in that the axial height t of the fairing section (2) is less than half the axial height K of the air inlet (3), and t = (0.04-0.06) D 2 。
10. A backward centrifugal ventilator characterized in that it comprises a through-flow structure of a ventilator as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221555046.6U CN217462598U (en) | 2022-06-21 | 2022-06-21 | Through-flow structure of ventilator and backward centrifugal ventilator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221555046.6U CN217462598U (en) | 2022-06-21 | 2022-06-21 | Through-flow structure of ventilator and backward centrifugal ventilator |
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| Publication Number | Publication Date |
|---|---|
| CN217462598U true CN217462598U (en) | 2022-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221555046.6U Active CN217462598U (en) | 2022-06-21 | 2022-06-21 | Through-flow structure of ventilator and backward centrifugal ventilator |
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| Country | Link |
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| CN (1) | CN217462598U (en) |
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- 2022-06-21 CN CN202221555046.6U patent/CN217462598U/en active Active
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